drivers/net/can/sja1000/sja1000.c

   1 /*
   2  * sja1000.c -  Philips SJA1000 network device driver
   3  *
   4  * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
   5  * 38106 Braunschweig, GERMANY
   6  *
   7  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of Volkswagen nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * Alternatively, provided that this notice is retained in full, this
  23  * software may be distributed under the terms of the GNU General
  24  * Public License ("GPL") version 2, in which case the provisions of the
  25  * GPL apply INSTEAD OF those given above.
  26  *
  27  * The provided data structures and external interfaces from this code
  28  * are not restricted to be used by modules with a GPL compatible license.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  31  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  32  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  33  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  34  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  35  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  36  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  37  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  38  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  39  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  40  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  41  * DAMAGE.
  42  *
  43  */
  44
  45 #include <linux/module.h>
  46 #include <linux/init.h>
  47 #include <linux/kernel.h>
  48 #include <linux/sched.h>
  49 #include <linux/types.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/ptrace.h>
  53 #include <linux/string.h>
  54 #include <linux/errno.h>
  55 #include <linux/netdevice.h>
  56 #include <linux/if_arp.h>
  57 #include <linux/if_ether.h>
  58 #include <linux/skbuff.h>
  59 #include <linux/delay.h>
  60
  61 #include <linux/can/dev.h>
  62 #include <linux/can/error.h>
  63
  64 #include "sja1000.h"
  65
  66 #define DRV_NAME "sja1000"
  67
  68 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
  69 MODULE_LICENSE("Dual BSD/GPL");
  70 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
  71
  72 static struct can_bittiming_const sja1000_bittiming_const = {
  73         .name = DRV_NAME,
  74         .tseg1_min = 1,
  75         .tseg1_max = 16,
  76         .tseg2_min = 1,
  77         .tseg2_max = 8,
  78         .sjw_max = 4,
  79         .brp_min = 1,
  80         .brp_max = 64,
  81         .brp_inc = 1,
  82 };
  83
  84 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
  85 {
  86         unsigned long flags;
  87
  88         /*
  89          * The command register needs some locking and time to settle
  90          * the write_reg() operation - especially on SMP systems.
  91          */
  92         spin_lock_irqsave(&priv->cmdreg_lock, flags);
  93         priv->write_reg(priv, REG_CMR, val);
  94         priv->read_reg(priv, SJA1000_REG_SR);
  95         spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
  96 }
  97
  98 static int sja1000_is_absent(struct sja1000_priv *priv)
  99 {
 100         return (priv->read_reg(priv, REG_MOD) == 0xFF);
 101 }
 102
 103 static int sja1000_probe_chip(struct net_device *dev)
 104 {
 105         struct sja1000_priv *priv = netdev_priv(dev);
 106
 107         if (priv->reg_base && sja1000_is_absent(priv)) {
 108                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
 109                        DRV_NAME, dev->base_addr);
 110                 return 0;
 111         }
 112         return -1;
 113 }
 114
 115 static void set_reset_mode(struct net_device *dev)
 116 {
 117         struct sja1000_priv *priv = netdev_priv(dev);
 118         unsigned char status = priv->read_reg(priv, REG_MOD);
 119         int i;
 120
 121         /* disable interrupts */
 122         priv->write_reg(priv, REG_IER, IRQ_OFF);
 123
 124         for (i = 0; i < 100; i++) {
 125                 /* check reset bit */
 126                 if (status & MOD_RM) {
 127                         priv->can.state = CAN_STATE_STOPPED;
 128                         return;
 129                 }
 130
 131                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
 132                 udelay(10);
 133                 status = priv->read_reg(priv, REG_MOD);
 134         }
 135
 136         dev_err(dev->dev.parent, "setting SJA1000 into reset mode failed!\n");
 137 }
 138
 139 static void set_normal_mode(struct net_device *dev)
 140 {
 141         struct sja1000_priv *priv = netdev_priv(dev);
 142         unsigned char status = priv->read_reg(priv, REG_MOD);
 143         int i;
 144
 145         for (i = 0; i < 100; i++) {
 146                 /* check reset bit */
 147                 if ((status & MOD_RM) == 0) {
 148                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
 149                         /* enable interrupts */
 150                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
 151                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
 152                         else
 153                                 priv->write_reg(priv, REG_IER,
 154                                                 IRQ_ALL & ~IRQ_BEI);
 155                         return;
 156                 }
 157
 158                 /* set chip to normal mode */
 159                 priv->write_reg(priv, REG_MOD, 0x00);
 160                 udelay(10);
 161                 status = priv->read_reg(priv, REG_MOD);
 162         }
 163
 164         dev_err(dev->dev.parent, "setting SJA1000 into normal mode failed!\n");
 165 }
 166
 167 static void sja1000_start(struct net_device *dev)
 168 {
 169         struct sja1000_priv *priv = netdev_priv(dev);
 170
 171         /* leave reset mode */
 172         if (priv->can.state != CAN_STATE_STOPPED)
 173                 set_reset_mode(dev);
 174
 175         /* Clear error counters and error code capture */
 176         priv->write_reg(priv, REG_TXERR, 0x0);
 177         priv->write_reg(priv, REG_RXERR, 0x0);
 178         priv->read_reg(priv, REG_ECC);
 179
 180         /* leave reset mode */
 181         set_normal_mode(dev);
 182 }
 183
 184 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
 185 {
 186         struct sja1000_priv *priv = netdev_priv(dev);
 187
 188         if (!priv->open_time)
 189                 return -EINVAL;
 190
 191         switch (mode) {
 192         case CAN_MODE_START:
 193                 sja1000_start(dev);
 194                 if (netif_queue_stopped(dev))
 195                         netif_wake_queue(dev);
 196                 break;
 197
 198         default:
 199                 return -EOPNOTSUPP;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int sja1000_set_bittiming(struct net_device *dev)
 206 {
 207         struct sja1000_priv *priv = netdev_priv(dev);
 208         struct can_bittiming *bt = &priv->can.bittiming;
 209         u8 btr0, btr1;
 210
 211         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
 212         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
 213                 (((bt->phase_seg2 - 1) & 0x7) << 4);
 214         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
 215                 btr1 |= 0x80;
 216
 217         dev_info(dev->dev.parent,
 218                  "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
 219
 220         priv->write_reg(priv, REG_BTR0, btr0);
 221         priv->write_reg(priv, REG_BTR1, btr1);
 222
 223         return 0;
 224 }
 225
 226 static int sja1000_get_berr_counter(const struct net_device *dev,
 227                                     struct can_berr_counter *bec)
 228 {
 229         struct sja1000_priv *priv = netdev_priv(dev);
 230
 231         bec->txerr = priv->read_reg(priv, REG_TXERR);
 232         bec->rxerr = priv->read_reg(priv, REG_RXERR);
 233
 234         return 0;
 235 }
 236
 237 /*
 238  * initialize SJA1000 chip:
 239  *   - reset chip
 240  *   - set output mode
 241  *   - set baudrate
 242  *   - enable interrupts
 243  *   - start operating mode
 244  */
 245 static void chipset_init(struct net_device *dev)
 246 {
 247         struct sja1000_priv *priv = netdev_priv(dev);
 248
 249         /* set clock divider and output control register */
 250         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
 251
 252         /* set acceptance filter (accept all) */
 253         priv->write_reg(priv, REG_ACCC0, 0x00);
 254         priv->write_reg(priv, REG_ACCC1, 0x00);
 255         priv->write_reg(priv, REG_ACCC2, 0x00);
 256         priv->write_reg(priv, REG_ACCC3, 0x00);
 257
 258         priv->write_reg(priv, REG_ACCM0, 0xFF);
 259         priv->write_reg(priv, REG_ACCM1, 0xFF);
 260         priv->write_reg(priv, REG_ACCM2, 0xFF);
 261         priv->write_reg(priv, REG_ACCM3, 0xFF);
 262
 263         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
 264 }
 265
 266 /*
 267  * transmit a CAN message
 268  * message layout in the sk_buff should be like this:
 269  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
 270  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
 271  */
 272 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
 273                                             struct net_device *dev)
 274 {
 275         struct sja1000_priv *priv = netdev_priv(dev);
 276         struct can_frame *cf = (struct can_frame *)skb->data;
 277         uint8_t fi;
 278         uint8_t dlc;
 279         canid_t id;
 280         uint8_t dreg;
 281         int i;
 282
 283         if (can_dropped_invalid_skb(dev, skb))
 284                 return NETDEV_TX_OK;
 285
 286         netif_stop_queue(dev);
 287
 288         fi = dlc = cf->can_dlc;
 289         id = cf->can_id;
 290
 291         if (id & CAN_RTR_FLAG)
 292                 fi |= FI_RTR;
 293
 294         if (id & CAN_EFF_FLAG) {
 295                 fi |= FI_FF;
 296                 dreg = EFF_BUF;
 297                 priv->write_reg(priv, REG_FI, fi);
 298                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
 299                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
 300                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
 301                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
 302         } else {
 303                 dreg = SFF_BUF;
 304                 priv->write_reg(priv, REG_FI, fi);
 305                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
 306                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
 307         }
 308
 309         for (i = 0; i < dlc; i++)
 310                 priv->write_reg(priv, dreg++, cf->data[i]);
 311
 312         can_put_echo_skb(skb, dev, 0);
 313
 314         sja1000_write_cmdreg(priv, CMD_TR);
 315
 316         return NETDEV_TX_OK;
 317 }
 318
 319 static void sja1000_rx(struct net_device *dev)
 320 {
 321         struct sja1000_priv *priv = netdev_priv(dev);
 322         struct net_device_stats *stats = &dev->stats;
 323         struct can_frame *cf;
 324         struct sk_buff *skb;
 325         uint8_t fi;
 326         uint8_t dreg;
 327         canid_t id;
 328         int i;
 329
 330         /* create zero'ed CAN frame buffer */
 331         skb = alloc_can_skb(dev, &cf);
 332         if (skb == NULL)
 333                 return;
 334
 335         fi = priv->read_reg(priv, REG_FI);
 336
 337         if (fi & FI_FF) {
 338                 /* extended frame format (EFF) */
 339                 dreg = EFF_BUF;
 340                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
 341                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
 342                     | (priv->read_reg(priv, REG_ID3) << 5)
 343                     | (priv->read_reg(priv, REG_ID4) >> 3);
 344                 id |= CAN_EFF_FLAG;
 345         } else {
 346                 /* standard frame format (SFF) */
 347                 dreg = SFF_BUF;
 348                 id = (priv->read_reg(priv, REG_ID1) << 3)
 349                     | (priv->read_reg(priv, REG_ID2) >> 5);
 350         }
 351
 352         cf->can_dlc = get_can_dlc(fi & 0x0F);
 353         if (fi & FI_RTR) {
 354                 id |= CAN_RTR_FLAG;
 355         } else {
 356                 for (i = 0; i < cf->can_dlc; i++)
 357                         cf->data[i] = priv->read_reg(priv, dreg++);
 358         }
 359
 360         cf->can_id = id;
 361
 362         /* release receive buffer */
 363         sja1000_write_cmdreg(priv, CMD_RRB);
 364
 365         netif_rx(skb);
 366
 367         stats->rx_packets++;
 368         stats->rx_bytes += cf->can_dlc;
 369 }
 370
 371 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 372 {
 373         struct sja1000_priv *priv = netdev_priv(dev);
 374         struct net_device_stats *stats = &dev->stats;
 375         struct can_frame *cf;
 376         struct sk_buff *skb;
 377         enum can_state state = priv->can.state;
 378         uint8_t ecc, alc;
 379
 380         skb = alloc_can_err_skb(dev, &cf);
 381         if (skb == NULL)
 382                 return -ENOMEM;
 383
 384         if (isrc & IRQ_DOI) {
 385                 /* data overrun interrupt */
 386                 dev_dbg(dev->dev.parent, "data overrun interrupt\n");
 387                 cf->can_id |= CAN_ERR_CRTL;
 388                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 389                 stats->rx_over_errors++;
 390                 stats->rx_errors++;
 391                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
 392         }
 393
 394         if (isrc & IRQ_EI) {
 395                 /* error warning interrupt */
 396                 dev_dbg(dev->dev.parent, "error warning interrupt\n");
 397
 398                 if (status & SR_BS) {
 399                         state = CAN_STATE_BUS_OFF;
 400                         cf->can_id |= CAN_ERR_BUSOFF;
 401                         can_bus_off(dev);
 402                 } else if (status & SR_ES) {
 403                         state = CAN_STATE_ERROR_WARNING;
 404                 } else
 405                         state = CAN_STATE_ERROR_ACTIVE;
 406         }
 407         if (isrc & IRQ_BEI) {
 408                 /* bus error interrupt */
 409                 priv->can.can_stats.bus_error++;
 410                 stats->rx_errors++;
 411
 412                 ecc = priv->read_reg(priv, REG_ECC);
 413
 414                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
 415
 416                 switch (ecc & ECC_MASK) {
 417                 case ECC_BIT:
 418                         cf->data[2] |= CAN_ERR_PROT_BIT;
 419                         break;
 420                 case ECC_FORM:
 421                         cf->data[2] |= CAN_ERR_PROT_FORM;
 422                         break;
 423                 case ECC_STUFF:
 424                         cf->data[2] |= CAN_ERR_PROT_STUFF;
 425                         break;
 426                 default:
 427                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
 428                         cf->data[3] = ecc & ECC_SEG;
 429                         break;
 430                 }
 431                 /* Error occurred during transmission? */
 432                 if ((ecc & ECC_DIR) == 0)
 433                         cf->data[2] |= CAN_ERR_PROT_TX;
 434         }
 435         if (isrc & IRQ_EPI) {
 436                 /* error passive interrupt */
 437                 dev_dbg(dev->dev.parent, "error passive interrupt\n");
 438                 if (status & SR_ES)
 439                         state = CAN_STATE_ERROR_PASSIVE;
 440                 else
 441                         state = CAN_STATE_ERROR_ACTIVE;
 442         }
 443         if (isrc & IRQ_ALI) {
 444                 /* arbitration lost interrupt */
 445                 dev_dbg(dev->dev.parent, "arbitration lost interrupt\n");
 446                 alc = priv->read_reg(priv, REG_ALC);
 447                 priv->can.can_stats.arbitration_lost++;
 448                 stats->tx_errors++;
 449                 cf->can_id |= CAN_ERR_LOSTARB;
 450                 cf->data[0] = alc & 0x1f;
 451         }
 452
 453         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
 454                                          state == CAN_STATE_ERROR_PASSIVE)) {
 455                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
 456                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
 457                 cf->can_id |= CAN_ERR_CRTL;
 458                 if (state == CAN_STATE_ERROR_WARNING) {
 459                         priv->can.can_stats.error_warning++;
 460                         cf->data[1] = (txerr > rxerr) ?
 461                                 CAN_ERR_CRTL_TX_WARNING :
 462                                 CAN_ERR_CRTL_RX_WARNING;
 463                 } else {
 464                         priv->can.can_stats.error_passive++;
 465                         cf->data[1] = (txerr > rxerr) ?
 466                                 CAN_ERR_CRTL_TX_PASSIVE :
 467                                 CAN_ERR_CRTL_RX_PASSIVE;
 468                 }
 469                 cf->data[6] = txerr;
 470                 cf->data[7] = rxerr;
 471         }
 472
 473         priv->can.state = state;
 474
 475         netif_rx(skb);
 476
 477         stats->rx_packets++;
 478         stats->rx_bytes += cf->can_dlc;
 479
 480         return 0;
 481 }
 482
 483 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
 484 {
 485         struct net_device *dev = (struct net_device *)dev_id;
 486         struct sja1000_priv *priv = netdev_priv(dev);
 487         struct net_device_stats *stats = &dev->stats;
 488         uint8_t isrc, status;
 489         int n = 0;
 490
 491         /* Shared interrupts and IRQ off? */
 492         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
 493                 return IRQ_NONE;
 494
 495         if (priv->pre_irq)
 496                 priv->pre_irq(priv);
 497
 498         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
 499                 n++;
 500                 status = priv->read_reg(priv, SJA1000_REG_SR);
 501                 /* check for absent controller due to hw unplug */
 502                 if (status == 0xFF && sja1000_is_absent(priv))
 503                         return IRQ_NONE;
 504
 505                 if (isrc & IRQ_WUI)
 506                         dev_warn(dev->dev.parent, "wakeup interrupt\n");
 507
 508                 if (isrc & IRQ_TI) {
 509                         /* transmission complete interrupt */
 510                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
 511                         stats->tx_packets++;
 512                         can_get_echo_skb(dev, 0);
 513                         netif_wake_queue(dev);
 514                 }
 515                 if (isrc & IRQ_RI) {
 516                         /* receive interrupt */
 517                         while (status & SR_RBS) {
 518                                 sja1000_rx(dev);
 519                                 status = priv->read_reg(priv, SJA1000_REG_SR);
 520                                 /* check for absent controller */
 521                                 if (status == 0xFF && sja1000_is_absent(priv))
 522                                         return IRQ_NONE;
 523                         }
 524                 }
 525                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
 526                         /* error interrupt */
 527                         if (sja1000_err(dev, isrc, status))
 528                                 break;
 529                 }
 530         }
 531
 532         if (priv->post_irq)
 533                 priv->post_irq(priv);
 534
 535         if (n >= SJA1000_MAX_IRQ)
 536                 dev_dbg(dev->dev.parent, "%d messages handled in ISR", n);
 537
 538         return (n) ? IRQ_HANDLED : IRQ_NONE;
 539 }
 540 EXPORT_SYMBOL_GPL(sja1000_interrupt);
 541
 542 static int sja1000_open(struct net_device *dev)
 543 {
 544         struct sja1000_priv *priv = netdev_priv(dev);
 545         int err;
 546
 547         /* set chip into reset mode */
 548         set_reset_mode(dev);
 549
 550         /* common open */
 551         err = open_candev(dev);
 552         if (err)
 553                 return err;
 554
 555         /* register interrupt handler, if not done by the device driver */
 556         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
 557                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
 558                                   dev->name, (void *)dev);
 559                 if (err) {
 560                         close_candev(dev);
 561                         return -EAGAIN;
 562                 }
 563         }
 564
 565         /* init and start chi */
 566         sja1000_start(dev);
 567         priv->open_time = jiffies;
 568
 569         netif_start_queue(dev);
 570
 571         return 0;
 572 }
 573
 574 static int sja1000_close(struct net_device *dev)
 575 {
 576         struct sja1000_priv *priv = netdev_priv(dev);
 577
 578         netif_stop_queue(dev);
 579         set_reset_mode(dev);
 580
 581         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
 582                 free_irq(dev->irq, (void *)dev);
 583
 584         close_candev(dev);
 585
 586         priv->open_time = 0;
 587
 588         return 0;
 589 }
 590
 591 struct net_device *alloc_sja1000dev(int sizeof_priv)
 592 {
 593         struct net_device *dev;
 594         struct sja1000_priv *priv;
 595
 596         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
 597                 SJA1000_ECHO_SKB_MAX);
 598         if (!dev)
 599                 return NULL;
 600
 601         priv = netdev_priv(dev);
 602
 603         priv->dev = dev;
 604         priv->can.bittiming_const = &sja1000_bittiming_const;
 605         priv->can.do_set_bittiming = sja1000_set_bittiming;
 606         priv->can.do_set_mode = sja1000_set_mode;
 607         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
 608         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
 609                 CAN_CTRLMODE_BERR_REPORTING;
 610
 611         spin_lock_init(&priv->cmdreg_lock);
 612
 613         if (sizeof_priv)
 614                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
 615
 616         return dev;
 617 }
 618 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
 619
 620 void free_sja1000dev(struct net_device *dev)
 621 {
 622         free_candev(dev);
 623 }
 624 EXPORT_SYMBOL_GPL(free_sja1000dev);
 625
 626 static const struct net_device_ops sja1000_netdev_ops = {
 627        .ndo_open               = sja1000_open,
 628        .ndo_stop               = sja1000_close,
 629        .ndo_start_xmit         = sja1000_start_xmit,
 630 };
 631
 632 int register_sja1000dev(struct net_device *dev)
 633 {
 634         if (!sja1000_probe_chip(dev))
 635                 return -ENODEV;
 636
 637         dev->flags |= IFF_ECHO; /* we support local echo */
 638         dev->netdev_ops = &sja1000_netdev_ops;
 639
 640         set_reset_mode(dev);
 641         chipset_init(dev);
 642
 643         return register_candev(dev);
 644 }
 645 EXPORT_SYMBOL_GPL(register_sja1000dev);
 646
 647 void unregister_sja1000dev(struct net_device *dev)
 648 {
 649         set_reset_mode(dev);
 650         unregister_candev(dev);
 651 }
 652 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
 653
 654 static __init int sja1000_init(void)
 655 {
 656         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
 657
 658         return 0;
 659 }
 660
 661 module_init(sja1000_init);
 662
 663 static __exit void sja1000_exit(void)
 664 {
 665         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
 666 }
 667
 668 module_exit(sja1000_exit);